Milk ducts can become blocked when the lactating breasts become very full (engorged) and are not emptied regularly. A blocked milk duct feels like a tender lump on the breast.
You can treat a blocked duct with self-care measures. To help unblock milk ducts, you can:
A blocked duct can become infected (mastitis). If you have signs of a breast infection (mastitis), you may need to call your doctor right away.
To learn more visit Healthwise.org